Does any one know any reliable plagiarism checks that will check my paper for FREE?

Here's one.

https://smallseotools.com/plagiarism-checker/

But it won't compare to paid sites like Turnitin

Teachers sometimes just pull a few different sentences out out of a paper and Google them. If it matches, word for word, any other paper you're busted. Try that.

Sites? Yes. Reliable? No. Free? No.

You should be able to check yourself. Did you paraphrase everything you got from sources, and cite your sources? Or are you asking for a site that will tell you if the stuff you plagiarized is going to show up on a plagiarism check? Nothing is as thorough as Turnitin. Go through the paper and make sure you've used your own words.